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05/29/2006 11:00:12 PM · #1 |
Hi I've searched the forum regarding the topic but they dont answer my question. In
this thread, there was mention of the Hoya R72 filter, and Tmhalling said that the exposure time was too long. My question is:
- what are the other grades/types of IR filter, and what are the differences in the numbers?
- how do you choose which filter to get?
- do all camera have the same sensitivity towards IR (will some allow shorter shutter speeds with the same effects)?
I know my camera can see IR as I have done the remote-control test :) Thanks |
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05/29/2006 11:05:55 PM · #2 |
No, not all cameras have the same sensitivity.
This site has a chart showing where various IR filters fall in terms of what they transmit.
Which one to get? It's up to you but the Hoya R72 is fairly inexpensive so is usually a good place to start. |
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05/29/2006 11:35:33 PM · #3 |
| Thanks for the link! I've read it and I'm happy to find out that my camera is very sensitive to IR! :) Anyway, anyone had experience with the Cokin P007 filter? It's supposed to be the same as the Hoya R72 but a lot cheaper. Thanks |
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05/30/2006 12:04:05 AM · #4 |
This was shot through a Cokin P007. I have to admit I really didn't know what I was doing technically with this one at the time but I really liked the effect.
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05/30/2006 12:14:25 AM · #5 |
Originally posted by 3DsArcher:
This was shot through a Cokin P007. I have to admit I really didn't know what I was doing technically with this one at the time but I really liked the effect. |
I hear some stories about the Cokin P007 "leaking" light on the sides - you have any experience with that? I hope it's just an isolated case. |
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05/30/2006 12:38:29 AM · #6 |
Hmmm funny you should mention that. I have found light spots on some of the photographs but just put it down to either the lense or the filter not being perfectly clean. I have shot more photographs with my cap over the top of the filter & this seems to have eliminated the problem. Cokin do filter hoods of a moduler design, you just keep clipping one hood on to the previous hood & the whole lot clips onto the filter bracket. I dont actually own one of the filter hoods but I am sure this would eliminate any light "leaking" in.
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05/30/2006 01:05:02 AM · #7 |
Originally posted by 3DsArcher:
Hmmm funny you should mention that. I have found light spots on some of the photographs but just put it down to either the lense or the filter not being perfectly clean. |
Do you have any examples of that? What I read about was that the "leak" is supposedly normal light (unfiltered) that is usually on the sides of the shot, meaning if you shoot full wide you'd probably see it. I'm considering getting a Cokin mainly due to the attractive price so any input would be greatly appreciated. |
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05/30/2006 03:45:21 AM · #8 |
I use the hoya r72 and i think it`s the best one to use for 3 reasons.
1, it`s one of the cheapest
2, it is not too strong so you can use quicker shutter speeds but this depends a lot on your camera.
3, it lets in some visable light which can give you colour ir photos.
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05/30/2006 03:59:10 AM · #9 |
Originally posted by marbo:
I use the hoya r72 and i think it`s the best one to use for 3 reasons.
1, it`s one of the cheapest
2, it is not too strong so you can use quicker shutter speeds but this depends a lot on your camera.
3, it lets in some visable light which can give you colour ir photos. |
Wow, Marbo (the IR dude). Thanks, but I was actually quoted more for the Hoya as compared to the Cokin? I'm not sure if I like #3, but maybe it's a good thing then. But I agree with #2 - I hope to get away without long exposures with the filter on :) |
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05/30/2006 06:13:16 AM · #10 |
I don`t know much about the Cokin P007 but if it`s like other cokin filters i have it`s a flat square type. So you must make sure you get the filter right up against the lens to stop light getting around the edges.
My hoya r72 is screw on but this means i`m stuck with the filter size of 52mm unless i use adaptors for different lenses.
Yes, some people prefer true infrared photos which are black and white but the colour can always be removed in photoshop.
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05/30/2006 08:33:47 AM · #11 |
| Yes, the Cokin P007 does leak light if you mount it like other Cokin filters by sliding it into one of the regular slots in the Cokin filter holder. My solution was to force it into the the slot meant for rotating filters. That slot is right up against the Cokin holder frame, so there is no light leakage. The only problem is that you really have to be careful sliding it in or you will scratch the filter. There are these tabs that hold the circular filters in place, one at the top and one at the bottom. Put a piece of soft cloth over the smaller tab and slide the P007 over it, then it shouldn't scratch. |
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05/30/2006 09:34:04 AM · #12 |
yes. listen to marbo and get the hoya r72 and simplify your life...
it's great fun...
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05/30/2006 05:55:06 PM · #13 |
Originally posted by crayon:
Do you have any examples of that? What I read about was that the "leak" is supposedly normal light (unfiltered) that is usually on the sides of the shot, meaning if you shoot full wide you'd probably see it. |
A test shot to work out camera settings. With the Cokin system having your filters mounted on a bracket in front of the lens as opposed to a screw in type filter, I think you will always be susseptible to light leaking in.
Magnus that method of yours sounds quite interesting. I going to give that a go.
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05/31/2006 10:43:02 PM · #14 |
I'd probably be getting the Hoya R72 very soon, thanks to all.
I have another question - why do people want to remove the IR-block filter of their digicams, eventhough the camera is already capable of taking IR with a normal IR filter? Does it make the sensor even more sensitive to IR, and would enable them to use higher filters (eg Hoya RM90) at faster shutter? what is the cons of removing that IR-block from the sensor? |
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05/31/2006 10:48:20 PM · #15 |
Originally posted by crayon:
I'd probably be getting the Hoya R72 very soon, thanks to all.
I have another question - why do people want to remove the IR-block filter of their digicams, eventhough the camera is already capable of taking IR with a normal IR filter? Does it make the sensor even more sensitive to IR, and would enable them to use higher filters (eg Hoya RM90) at faster shutter? what is the cons of removing that IR-block from the sensor? |
yes. exactly... removing the filter makes the camera sensitive enough to ir so that you can actually take photos at nearly normal shutter speeds...
of course, you pretty much ruin your camera for regular applications...
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05/31/2006 11:00:09 PM · #16 |
Originally posted by kudzu:
of course, you pretty much ruin your camera for regular applications... |
that is what I read from 2-3 sites that has a tutorial on removing IR-block filters from the sensor. But how bad is it exactly? |
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05/31/2006 11:31:23 PM · #17 |
If you leave the filter in place, you cannot see anything when you look through the dslr eyepiece. This is what I do to take a picture:
1) Set up camera on tripod, compose and focus image. IR focuses differently from visible light so guess at the compensation to make.
2) Attach R72 filter.
3) Close eyepiece (olympus E-10) so no light comes in through the back way.
4) take exposure, letting camera determine settings. Wide open at 1 to 2 seconds is normal.
If you have the IR block filter removed and replaced with an IR pass filter, then you have a camera that can ONLY take IR photo. But then:
1) You hand-hold the camera and compose/shoot just like you do normally. That's it--no fuss. Exposures in bright light are around a 1/60 of a second. You can take pictures of people and other subjects that move too much to capture sharply with a 2 second exposure.
I know people who like to use IR to shoot nudes. They get very good skin tones.
I have no experience with a converted camera. I have shot with a R72 filter on my Olympus E-10 and found it to be a hassle.
--DanW
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06/01/2006 12:06:59 AM · #18 |
Originally posted by wheeledd:
I have no experience with a converted camera. I have shot with a R72 filter on my Olympus E-10 and found it to be a hassle. |
I guess I'm lucky my camera is EVF. I'll be getting the R72 soon :) |
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